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FC200 OPEN CHANNEL FLOW MONITOR
Take Open Channel Flow Measurement and meter total flows
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FEATURES:
- Digital LCD screen
- Easy-to-use interface with user selectable flow tables
- Highly accurate depth probe
- Output signal for recorders or displays
- Sampler triggering output
- Water resistant enclosure
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Open Channel Flow Monitor Product Description
Global Water's Open Channel Flow Monitor is reliable and
accurate for measuring and totalizing open channel flows for all flumes and weirs, as well as for any
gravity-type open-channel flow application. The flow meter measures water depth with Global
Water's highly accurate pressure transducer, and the unit's electronic
circuitry instantly calculates and displays water flow and totalizer values for any depth-to-flow
relationship in any engineering units. The Open Channel Flow Monitor is easy to set up in the
field using a unique four-button programming system.
Open Channel Flows
For any open channel that is free flowing, there is a specific relationship between depth of water and
flow rate. Whenever a given depth occurs, there will always be the same flow. Therefore,
if the flow rate is known for each depth, a depth-to-flow relationship can be constructed. The
Open Channel Flow Monitor is pre-programmed with depth-to-flow relationship tables. When the
user digitally selects the correct depth-to-flow relationship for an application, the Open Channel Flow
Monitor's LCD screen automatically displays accurate flow rate measurements for any depth that is
reached. This water flow is averaged over time to display total flow.
When using a primary device to measure flow, such as a measuring flume or weir, there is a mathematical
relationship between depth and flow. When measuring flow in a channel that does not have a
primary device, the depth-to-flow table can be constructed by measuring the flow at several different
depths, using Global Water's Flow Probe.
Depth Measurement
Global Water's Open Channel Flow Monitor measures flow depth with the highly-accurate
WL400 Water Level Sensor, which is a fully submersible water level
sensor constructed of stainless steel. The standard level range is from 0 to 3' of water, which
provides for accurate flow measurements even with a depth change as small as a fraction of an
inch. The pressure transducer is mounted slightly below the "zero" flow depth of the
channel, upstream from the throat of the flume or weir. For open channels with no primary
device, the sensor is mounted below the lowest expected water depth. The water level sensor
has a 2-wire 4-20 mA signal, so the flow computer can be mounted several hundred feet away, if
required. The sensor and computer can be connected with standard, twisted-pair signal wire.
Global Water also offers an ultrasonic water level sensor that allows the Open Channel Flow Monitor
to measure semi-solid flows or flows that are not suitable for a standard submersible pressure
transducer. Global Water recommends that the ultrasonic sensor option only be used in areas
where AC power is available. You should strongly consider using a submersible pressure
transducer for applications that are in areas without AC power.
Display and Outputs
The Open Channel Flow Monitor displays flow rate on a large 6-digit LCD screen. The totalized
output is shown on a second LCD display. The display reads in user-defined units of flow,
including mgd, csf, gpm, m3s.
The Flow Monitor also produces an analog 4-20 mA output signal that is proportional to flow. This
can be used for chart recorders, dataloggers, or as an input to telemetry or process control
systems. In addition, the meter has a flow-proportional output signal for triggering
water samplers.
Digital Flow Computer
The Global Water Open Channel Flow Monitor has powerful internal electronic circuitry that calculates
and totalizes flow. Desired engineering units and depth-flow relationships (from over 20
pre-defined tables) can easily be selected using the unit's four front panel push buttons. User
programming does not require the unit's enclosure to be opened. The unit's manual includes
programming information, including depth-to-flow tables for all standard flumes and weirs.
Enclosure
The enclosure is made of weatherproof injection molded plastic. It is suitable for use in a wide
variety of environments. The enclosure can be wall-mounted and fitted with conduit for sensor and
power connections, if required.
Open Channel Flow Monitor Specifications
Rate Display: 6 digit + decimal place, LCD
Totalizer Display: 6 digit + decimal place, LCD
Accuracy: Pressure transducer: +0.2% FS + Flow Monitor: +0.01% + the depth-flow-table error
Flow Units: CFS, GPM, m3s, MGD
Totalizer: Related to Flow Units
Power: 120 VAC to 240 VAC, optional: Battery powered (Must be specified at time of ordering)
Current Draw: 60mA Typical, 100mA max when the output relays are on, and 100uA in sleep mode
Enclosure: 4-3/4x8x3 inch (12x20x7-1/2 cm) (WxHxD), NEMA 4X (IP67)
Weight: 3.4 lbs (1.54 kg)
Pre-defined Tables
Parshall: 1", 2", 3", 6", 9", 12"
Palmer-Bowlus (4D): 4", 6", 8", 10", 12", 15"
Weir: 45° V notch, 90° V notch, 1' rectangular, 2' rectangular
H: 0.4HS, 0.6HS, 0.5H, 0.75H, 1.0H, 1.5H, 2.0H
Trapezoidal: 60°
Custom Table
You must provide Global Water with a depth to flow equation or look up table at time of order. Please
allow for longer lead times.
Open Channel Flow Monitor Sensor
Sensing Element
Sensor Element: Silicone Diaphragm, Wet/Wet Transducer
Pressure Range: 0-3'
Linearity and Hysteresis: ±0.1% FS
Accuracy: ±0.1% of full scale at constant temperature, ±0.2% over 35-70°F (1.37-21.1°C) range
Overpressure: Not to exceed 2 x full scale range
Resolution: Infinitesimal (Analog)
Outputs: 4-20 mA or 0.5 to 2.5 VDC across 125 ohms
Supply Voltage: 8 to 36 VDC
Current Draw: Same as sensor output
Warm Up Time: 3 seconds recommended
Operating Temperature: 0 (not frozen) to +185°F (-17 (not frozen) to +85°C)
Compensation: Uses dynamic temperature compensation 30-70°F. Automatic barometric pressure compensation
Weight: 1/2 lb (227 g)
Housing
Material: 304L Stainless Steel, SS microscreen (hundreds of holes to prevent fouling), electronics are fully encapsulated in marine grade epoxy, guaranteed not to leak
Size: up to 13/16" diameter x 5 1/2" long (2 cm dia. x 14 cm long)(small enough for a 1" well)
Vented Cable
Conductors: 4 each 22 AWG
Material: Marine grade polyether jacket, polyethylene vent tube, full foil shield
Outer Diameter: 0.306 inch (0.78 cm)
Temperature Range: -22° to +185°F (-30° to +85°C)
Weight:0.7 oz/ft (~65g/m)
Length: Standard 25' (7.62 m) (up to 500' (152.4 m) from factory)
Open Channel Flow Monitor Options & Prices
Prices listed are for United States and Canada only. Call or e-mail us for pricing in other countries.
Terms and Conditions
ORDER NOW
FC200 Open Channel Flow Monitor (PN# BH0000)
0-3' Depth Sensor on 25' of cable included. Please specify flume/weir type when placing order.
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$1,570 |
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FC200-U Open Channel Flow Monitor (PN# BH0400)
0.17’ to 1.00’ ultrasonic sensor on 10' of cable included (for use with AC power only). Please specify flume/weir type when placing order.
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$1,680 |
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FC200-D Open Channel Flow Monitor Datalogging Option (PN# BHA000)
0-3' Depth Sensor on 25' of cable included. Please specify flume/weir type when placing order. Includes
internal GL500S-2-1 serial datalogger.
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$1,848 |
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FCBAT Battery Option (PN# BH0500)
Includes Heavy-Duty Weather Resistant Environmental Enclosure and 12V, 4.5Ah rechargable battery.
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$204 |
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PDAGL500 Deluxe PDA Package (PN# AK0500)
Handheld PDA download package for GL500.
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$709 |
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